I have added a custom ASP.Net control in the blog engine to display a panel that helps in sharing posts and links with social networking sites. This is similar to button that some web sites offer to "Share It" kind of thingy. You have source
for server control as well as JS behind it. Let me know if you have any questions.

I am not sure if there is some setting in blogengine to make URLs sticky so that they don't change if you make some change to title of existing posts or pages.
I got burnt by it that I made a change to title of a page and then all people who bookmarked it got broken links. So I made this change to my custom version where you can make this title/URLs sticky and change the display title different from what is used to
generate URLs. You can read more details here. Use updates code if you find it useful for your blog.BlogEngine Custom Updates